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objmap.h

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00001 // Copyright (C) 2001 Open Source Telecom Corporation.
00002 //  
00003 // This program is free software; you can redistribute it and/or modify
00004 // it under the terms of the GNU General Public License as published by
00005 // the Free Software Foundation; either version 2 of the License, or
00006 // (at your option) any later version.
00007 // 
00008 // This program is distributed in the hope that it will be useful,
00009 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00010 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00011 // GNU General Public License for more details.
00012 // 
00013 // You should have received a copy of the GNU General Public License
00014 // along with this program; if not, write to the Free Software 
00015 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00016 // 
00017 // As a special exception to the GNU General Public License, permission is 
00018 // granted for additional uses of the text contained in its release 
00019 // of Common C++.
00020 // 
00021 // The exception is that, if you link the Common C++ library with other
00022 // files to produce an executable, this does not by itself cause the
00023 // resulting executable to be covered by the GNU General Public License.
00024 // Your use of that executable is in no way restricted on account of
00025 // linking the Common C++ library code into it.
00026 // 
00027 // This exception does not however invalidate any other reasons why
00028 // the executable file might be covered by the GNU General Public License.
00029 // 
00030 // This exception applies only to the code released under the 
00031 // name Common C++.  If you copy code from other releases into a copy of
00032 // Common C++, as the General Public License permits, the exception does
00033 // not apply to the code that you add in this way.  To avoid misleading
00034 // anyone as to the status of such modified files, you must delete
00035 // this exception notice from them.
00036 // 
00037 // If you write modifications of your own for Common C++, it is your choice
00038 // whether to permit this exception to apply to your modifications.
00039 // If you do not wish that, delete this exception notice.  
00040 
00041 #include <cc++/strchar.h>
00042 
00043 namespace ost {
00044 
00045 template <class T, class K, unsigned S>
00046 class objMap {
00047 protected:
00048         static T *objIndex[S];
00049         T* objNext;
00050         const K objKey;
00051 
00052         virtual unsigned keyIndex(K k)
00053         {
00054                 unsigned idx = 0;
00055                 unsigned char *p = (unsigned char *)&k;
00056                 unsigned len = sizeof(K);
00057 
00058                 while(len--)
00059                 {
00060                         idx ^= (idx << 1) ^ *p;
00061                         ++p;
00062                 }       
00063                 return idx % S;         
00064         }
00065 
00066         inline unsigned getSize(void)
00067         {
00068                 return S;
00069         }
00070 
00071         objMap(const K key)
00072         {
00073                 unsigned idx = keyIndex(key);
00074                 objKey = key;
00075                 objNext = objIndex[idx];
00076                 objIndex[idx] = (T *)this;
00077         }
00078 public:
00079         static T *getObject(keystring key);
00080 };
00081 
00082 template <class T, unsigned S>
00083 class keyMap : public objMap<T, keystring, S>
00084 {
00085         keyMap(keystring key) : objMap<T, keystring, S>(key) {};
00086         
00087         unsigned keyIndex(keystring k)
00088         {
00089                 unsigned idx = 0;
00090                 while(*k)
00091                 {
00092                         idx = (idx << 1) ^ (unsigned)*k;
00093                         ++k;
00094                 }
00095                 return idx % S;
00096         }
00097 };
00098 
00099 template <class T, class K, unsigned S>
00100   T *objMap<T, K, S>::objIndex[S](0);
00101 
00102 template <class T, class K, unsigned S>
00103 T *objMap<T, K, S>::getObject(const keystring key)
00104 {
00105         T *obj = objIndex[keyIndex(key)];
00106         while(obj)
00107         {
00108                 if(key == obj->objKey)
00109                         break;
00110                 obj = obj->objNext;
00111         }
00112         return obj;
00113 }        
00114 
00115 }

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